resize()使您可以更改字符數。這是我們將描述C++中std::string::resize()支持的兩種語法
返回值：沒有
語法1：將* this的字符數調整為num。
void string::resize (size_type num) num:New string length, expressed in number of characters. Errors: Throws length_error if num is equal to string::npos. Throws length_error if the resulting size exceeds the maximum number of characters(max_size()).
注意：如果num> size()，則其餘字符由“ \ 0”初始化。
// CPP code for resize (size_type num)
#include <iostream>
#include <string>
using namespace std;
// Function to demonstrate insert
void resizeDemo(string str)
{
// Resizes str to a string with
// 5 initial characters only
str.resize(5);
cout << "Using resize:";
cout << str;
}
// Driver code
int main()
{
string str("GeeksforGeeks ");
cout << "Original String:" << str << endl;
resizeDemo(str);
return 0;
}輸出：
Original String:GeeksforGeeks Using resize:Geeks
語法2：使用字符填充size()和num之間的差異。
void string::resize (size_type num, char c ) num:is the new string length, expressed in number of characters. c:is the character needed to fill the new character space. If num > size(): character c is used to fill space. If num < size(): String is simply resized to num number of characters. Errors: Throws length_error if num is equal to string::npos. Throws length_error if the resulting size exceeds the maximum number of characters(max_size()).
// CPP code for resize (size_type num, char c )
#include <iostream>
#include <string>
using namespace std;
// Function to demonstrate insert
void resizeDemo(string str)
{
cout << "Using resize:" << endl;
cout << "If num > size():";
// Resizes str to character length of
// 15 and fill the space with '$'
str.resize(15, '$');
cout << str << endl;
cout << "If num < size():";
// Resizes str to a string with
// 5 initial characters only
str.resize(5, '$');
cout << str;
}
// Driver code
int main()
{
string str("GeeksforGeeks");
cout << "Original String:" << str << endl;
resizeDemo(str);
return 0;
}輸出：
Original String:GeeksforGeeks Using resize: If num > size():GeeksforGeeks$$ If num < size():Geeks
相關用法
注：本文由純淨天空篩選整理自 std::string::resize() in C++。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。